<!DOCTYPE html>
<html>
	<head>
		<meta charset="UTF-8">
		<title></title>
	</head>
	<body>
	</body>
	<script type="text/javascript">
		function Person() {
			this.age = 15;
			setInterval(growUp=()=> {
				this.age++;
				console.log(this.age);
			}, 1000);
		}
		var p = new Person();
		console.log(p.age);
	</script>
</html>
